He was a two-time All-metro quarterback who led his school through two consecutive undefeated championship seasons and set a Maryland Interscholastic Athletic Association record for pass completion percentage.

He is also a three-time Team USA representative and two-time gold medalist at the World Lacrosse Championship.

[6] Boyle also played basketball in high school and was co-winner of the Greater Baltimore Chapter National Football Foundation Hall of Fame scholar athlete award as a senior.

[10] As a junior, he set the Maryland state high school single-season pass completion percentage record of 78 percent (surpassing 69.4 established by Ryan Fleetwood of Cambridge) on 117 of 150 passing for 1,908 yards and 20 touchdowns in addition to rushing for 535 yards and five touchdowns.

[15][16] in the 1998 championship game 16–12 victory over St. Paul's High School, he scored four goals and had an assist.

[17] As a junior, he totaled 23 goals and 28 assists to go with 60 ground balls, even though he missed three games for a surgical procedure.

[6] In the 2000 lacrosse championship game, he had four goals and assist in the 10–8 victory over Boys' Latin School of Maryland.

[4] He attended college at Princeton University, graduating in 2004 where he was a four-time All-American, including being named First Team Attack twice.

[25][26][27][33] The arrival of freshman Boyle necessitated that senior Matt Striebel move from attack to midfield and the demotion of head coach Bill Tierney's son, Brendan, to the bench.

[2][34] Striebel had previously orchestrated the Princeton offense from behind the goal and both players had started in the 2000 NCAA Division I Men's Lacrosse Championship game, but on March 25, 2001, which was the first practice after the team lost 14–8 to Syracuse, Tierney made the switch.

[34] In the 2001 game against Dartmouth to clinch the Ivy League championship, he scored three goals and had two assists as part of a 14-point 3-game stretch.

[36] In the 2001 NCAA championship tournament quarterfinal 8–7 victory over Loyola, he had three assists including two that broke a 4–4 tie in the second half.

[38] In the 2001 NCAA championship game, Boyle assisted on B. J. Prager's overtime game-winning goal against Syracuse from behind the net.

[40] In the 2002 NCAA Division I Men's Lacrosse Championship tournament, he scored the game-winning goal in the quarterfinal game against Georgetown with four seconds left in regulation time.

[43] In the championship game against Syracuse, he scored two goals in the first quarter but was held scoreless for the rest of the 13–12 loss.

[33] In the 2004 NCAA Division I Men's Lacrosse Championship tournament opening round, he scored a career-high four goals as Princeton defeated Rutgers 12–4.

In the January 20, 2007, first box lacrosse game played at Madison Square Garden, he scored two goals and two assists, but made more news off the field when he was photographed signing autographs for Cody Lohan and his picture appeared on Perez Hilton's blog.

[60] Boyle was named 2004 Major League Lacrosse Rookie of the Year,[56] and he has helped lead the Philadelphia Barrage to win MLL Steinfeld Cup Championships in 2004, 2006, and 2007.

In the 2004 championship game against the Boston Cannons, he helped break a 6–6 tie with one of the goals giving Philadelphia an 8–6 halftime lead on the way to their 13–11 victory.

In the 2008 MLL semifinals, Boyle scored two goals and had three assists in the Philadelphia Barrage 16–15 overtime loss to the Rochester Rattlers.

[63] In the 2010 MLL semifinals, Boyle scored two goals for the Boston Cannons in the 13–9 loss to the Chesapeake Bayhawks.